A DPS spokesperson later said that the Austin Police Department was responsible for the shutdown. Earlier Monday, APD said they were not aware of the lane closures and later sent a tweet saying Travis County Constables were assisting with construction in the area, and deferred calls to that department.

But officials with the MoPac Improvement Project also tweeted to frustrated drivers ensuring them the backup was not due to the ongoing construction in the area.

Major Delays! Southbound MoPac Far West to Bee Caves Road due to accident investigation re-enactment unrelated to construction. #ATXtraffic